Shallow well pump



Oct. 22, 1957 I K. R. LUNG 2,81

SHALLOW WELL PIUMP Filed Aug. 11, 1953 2 Sheets-Sheet 1 FIG 4 2O 24 74 2as 0 s l W A FIG-3 INVENTOR. I 45 KENNETH R. LUNG BY Mm "7W ATTORNEYSOct. 22, 1957 K. R. LUNG 2,810,346

SHALLOW WELL PUMP Filed Aug. 11, 1953 2 Sheets-Sheet 2 INVENTOR- KENNETHR. LUNG BY 7M ATTORNEYS tinite rates 2,810,346 Patented Oct. 22, 1 957Fice SHALLOW WELL PUMP Kenneth R. Lung, Dayton, Ohio, assignor to TheTait Manufacturing Company, a corporation of Ohio Application August 11,1953, Serial No. 373,564

1 Claim. (Cl. 103-5) This invention relates to pumps, particularlycentrifugal pumps, and more particularly still to shallow wellcentrifugal pumps having a jet pump in combination therewith.

A particular object of this invention is the provision of a shallow welljet pump which is less expensive to manufacture than jet pumps of thistype of the prior art.

A still further object of this invention is the provision of an improvedconstruction of a shallow well pump of the nature referred to whichconsiderably reduces the machine work necessary to prepare the parts ofthe pump unit for assembly.

Another object of this invention is the provision of an improved seal,especially for use in connection with pumps of the nature referred to.

A particular object is the provision of a jet pump and a centrifugalpump in combination so constructed as to be extremely compact andeflicient in operation.

Another object is the provision of a centrifugal pump and jet pump incombination in 'a single unit so constructed that the assembly of theunit is simplified, and wherein economies can be effected in themanufacture of the pump unit.

These and other objects and advantages will become more apparent uponreference to the following description taken in connection with theaccompanying drawings, in which:

Figure 1 is a perspective view of a shallow well pumping unit accordingto my invention;

Figure 2 is a vertical section, indicated by cutting plane 2-22 onFigure 1;

Figure 3 is a fragmentary section, indicated by line 3--3 on Figure 2;

Figure 4 is a fragmentary view drawn at enlarged scale showing theconstruction of a novel .seal betweenthe pump rotor and the frame of thepump;

Figure 5 is a view like Figure 2 but showing a modified construction;and

Figure 6 is a sectional view, indicated by line- 6-6, showing theconstruction of the pump impeller in the Figure 5 arrangement.

Referring to the drawings: somewhatgmore infdetail, the pumping assemblyaccording to my invention comprises a drive motor 10 mounted on the backface of a mounting bracket 12, and on the front face of the mountingbracket is the pumping unit 14.

Mounting bracket 12 comprises feet 16 by means of which it can be boltedto a suitable platform or to a tank, and this forms the sole support forthe motor and pump assembly.

As will be seen in Figure 2, motor 10 has an output shaft 18 extendingthrough a Wall 20 in the mounting bracket 12 through a seal 22. Securedto shaft 18 is the centrifugal pump impeller 24 which is rotatablewithin a pumping chamber 26 formed by the wall 27 in the main pumpcasing 28, and this casing is of generally bell-shape to provide aprincipal cavity or main discharge chamber 30 of similar shape as shownin Fig. 2.

Impeller 24 discharges into the principal cavity 30 of the pump body 28via passage means 32, and pumping fluid under pressure is withdrawn fromcavity 30 through the outlet port 34 and discharge line 35.

Adjacent the right end of body 28, as it is viewed in Figure 2, thereare transversely extending wall part 36, best seen in Figures 2 and 3,and which wall part includes front and rear walls 37 and 39, a chamber38 communicating with the suction inlet 40 of the body 28 to which asuction line 41 is connected as shown in Fig. 1. The walls 37 and 39 arespaced rearwardly from the forward end of the chamber 30 to provide aspace therein forwardly of the wall portion 39 which is in communicationwith the remainder of chamber 30. The wall portion 39 has mountedtherein a nozzle 42 which extends through an aperture 43 and receivesfluid from the space to the right of wall portion 39. The nozzle 42discharges this fluid into the inlet end of Venturi tube 44 supported.in the wall portion 37. Venturi tube 44 tapers outwardly,

and its larger outlet end is adjacent the eye of impeller 24 and ispress-fitted in a central aperture 45in wall 46, which encloses the faceof impeller 24. U V a The inlet end of Venturi tube 44 opposite impeller24 is carried in a block 48 fitting in an. aperture 49 in the wallportion 37 and sealed thereto as by the resilient rubber-like O-ring 59.The aperture 49 is aligned with but smaller than the aperture 45, andboth vof these apertures are proportioned to provide forassembling'ofthe Venturi tube 44 Within the casing 28 by inserting the smaller'end ofthe tube through the opening 45 from left to right in Fig. 2. v

Venturi tube 44 and nozzlev 42 are. advantageously formed byswagingbrasstubing to the proper configura-, tion, and the nozzle is simplypress-fitted into the righthand side of wall portion 39 through the port51 which is plugged during use of the pump. The outlet end of theVenturi tube 44 is press-fitted into the aperture 45 in wall portion 37and has the block 48 at its other end sealingly extending through theaperture. 45 in wall portion 37.v

This is an inexpensive and simply arrived at construction but is,nevertheless, effective andhas proved to besuitable under allcircumstances.

In particular, it will be noted that the end of Venturitube 44 is flaredoutwardly so that the end of block 43- is completely covered, thuspermitting the. block 48 to be In Figure 2 it will be noted that bracketmember 12 comprises a recess 52 of substantial size immediately behindimpeller 24, andthe provision of this recessis an important feature ofthis invention, because the cylindrical outer wall of recess 52 providesmeansfor chucking the bracket member in a machine with all of thesurfaces of the bracket member that must be machined exposed, so thatwith" a single chucking operation the'bracket member can be entirelymachined, thus eliminating the multiple chucking and machiningoperations that were previously :carried out on members of this natureand enabling the member to be more inexpensively made than waspreviously possible.

For example, with the bracket member 12 chucked by engagement with theouter cylindrical surface of recess 52, the surfaces indicated at 54 and56 on the motor side of mounting bracket 12 and as at 58 and 60 on thepump side of bracket 12, all can be machined without unchucking themember.

Turning now to Figure 4, the novel seal arrangement and the mounting ofthe impeller on output shaft 18 is illustrated more in detail. Aparticular feature of this invention is in the tubular projection 62extending backring 64 surrounding the back. end of tubular projection 62carries a set screw 66 which extends through the tubular projection andengages keyway 68 in shaft 18. This arrangement at one timeclamps theimpeller in a predetermined axial position onthe shaft and also connectsthe shaft and impeller drivingly together.

As to the sealing arrangement, a particular feature n connectiontherewith is the cup-like element 70 pressed into the central recess inwall 20 of mounting bracket 12. This element is preferably of brass soas to be corrosion resistant,but it will be evident that at any time theseal becomes inoperative or corroded, it can be removed in its entiretyand replaced by another at low cost, and with little difliculty, asopposed to previous seal arrangements; where the seal bore againstamachined surface on a housing member. i

The seal consists essentially of graphite rings 72 and 74, a metallicring 76, a rubber-like block 78, and a spring 80 acting between block 78and metal cup 82 that surrounds graphite ring 72, thereby to press thegraphite rings against the impeller and cup element 70, thus effecting aseal preventing leakage of fluid from about tubular projection 62.

The pump illustrated in Figures and 6 is substantially identical withthe one illustrated in Figures 1 through 4 and corresponding referencenumerals have been applied to Figures 5 and 6 where applicable, with theaddition of a subscript a.

The essential difference between the pump structures of Figures 5 and 6and that of Figures 1 through 4 is that in Figure 5 a Venturi tube 100is provided which is substantially shorter than Venturi tube 44 of thefirst modification. Because of the shortness of Venturi tube 100, thefluid entering impeller 102 of the Figures 5 and 6 modifications will bemoving at a much greater velocity than the fluid that enters in theFigures 1 through 4 modification. In order to convert the velocity headof the fluid entering impeller 102, it is formed as indicated in Figure6, wherein the blades or vanes 104 thereof are so arranged, incooperation with the outwardly converging front and back plates of theimpeller, that each space or passageway 106 between the blades or vanestapers in such manner that these passageways are of increasing flow areain the direction of outward flow therethrough so that a portion of thefunction of the Venturi tube of converting the velocity head of thefluid to pressure head is transferred to the impeller. This arrangementpermits the pump to be made in an extremely compact form, as will beapparent on inspection of Figure 4, and this, ,of course, results in amore economical construction and a pump unit which can be used incramped locations that might not accommodate a conventional pumpstructure of the overall dimensions of the Figure 1 modification.

It will be understood that this invention is susceptible to modificationin order to adapt it to different usages and conditions, and,accordingly it is desired to comprehend such modifications within thisinvention as may fall within the scope of the appended claim.

I claim:

In a pump of the character described, a pump casing enclosing adischarge chamber, a first wall within the back of said casing havingtherein a centrally located inlet aperture, means cooperating with saidfirst wall to form a pumping chamber on the opposite side of said wallfrom said discharge chamber, means including second and third wallsextending across the front end of said discharge chamber and formingtherein a suction chamber adapted for connection with a suction line andproportioned to leave a space forwardly thereof and in communicationwith the remainder of said discharge chamber, said first and secondwalls being separated from each other except through said casing toprovide open and unobstructed space between said walls, said second wallhaving therein an aperture aligned with and smaller than said first wallaperture, a Venturi tube having the outlet end thereof larger than theinlet end thereof and larger than said second wall aperture, saidVenturi tube having said outlet and inlet ends.thereof received insealing engagement within said first and second wallapertures'respectively to extend across said open and unobstructed spacefrom said second wall to said first-wall to deliver liquid directly tosaid pumping chamber from said suction chamber, said third wall havingan aperture therethrough n alignment with said Venturi tube and openinginto said space within the front end of said casing, said casing havinga port through the front end thereof larger than and aligned with saidthird wall aperture, a jet nozzle press-fitted in said third wallaperture through said port with the inlet end thereof in communicationwith said space, a removable plug closing said port, said Venturi tubebeing proportioned to deliver said liquid to said pumping chamber inletaperture at relatively high velocity with respect to the velocity ofsaid liquid through the throat of said tube, and impeller in saidpumping chamber including a plurality of enclosed pumping passagewaysextending outwardly therein from a centrally located inlet registeringwith said pumping chamber inlet aperture, and said pumping passagewaysin said impeller being of increasing flow area in the direction ofoutward flow therethrough to supplement the operaton of said Venturitube and to provide an outlet velocity of said liquid with respect tosaid impeller which is lower than the inlet velocity of said liquid withrespect to said impeller.

References Cited in the file of this patent UNITED STATES PATENTS1,931,724 Fageol Oct. 24, 1933 2,274,987 Lung Mar. 3, 1942 2,335,109Conery Nov. 23, 1943 2,403,555 Ruth July 9, 1946 2,478,941 Piccardo Aug.16, 1949 2,524,770 Conery Oct. 10,1950 2,615,397 Conery Oct. 28, 19522,631,539 r Wolfe Mar. 17, 1953 2,651,998 Bergh Sept. 15, 1953 2,664,823Steenrod Jan. 5, 1954 2,677,327 MacNeille May 4, 1954 FOREIGN PATENTS651,299 Great Britain Mar. 14, 1951

